Document not expiring in mongodb using mongoose - mongodb

Question

I am storing my refresh tokens in mongodb database. For testing purposes I want them to expire in 4 minutes. For some reason, this thing is not working for me.
const mongoose = require('mongoose');
let schema = new mongoose.Schema({
token: {
type: String,
required: true
},
username: {
type: String,
required: true
},
email: {
type: String,
required: true
},
});
schema.index({expireAt: 1}, {expiresAfterSeconds: 240}); //4 mins * 60 seconds
let model = mongoose.model('refresh_token', schema);
module.exports = model;
This is the complete code of my file. I am using this to create the refresh tokens. The item is persisting for an hour as of now. Please shed some light on my mistake.

Answer 1

OK, I solved the issue and it was a blunder from my side.
If you are using mongoose and doing the testing, you would most likely be changing the TTL expire time. I was changing it to see if it was working and for different testing purposes but once the document is created in the atlas, requesting a different TTL time won't overwrite the previous one. I changed the time from 30 months to 5 minutes and did a lot of fluctuation for testing purposes.
So keep this in mind that once the model is created, the TTL will be locked and you need to delete the collection and re-build it otherwise you have to change the TTL settings manually in the atlas(I didn't checked this out because my problem was solved with this only and I was in testing mode of my application). Also
thanks to wak786
for proposing to see the documentation again. It clicked when I was reading how indexing works.
My final refresh token file looks like this after I deleted the collection(actually renamed it).
const mongoose = require('mongoose');
let schema = new mongoose.Schema({
token: {
type: String,
required: true
},
username: {
type: String,
required: true
},
email: {
type: String,
required: true
},
createdAt: {
type: Date,
default: new Date()
}
});
schema.index({"createdAt": 1}, {expireAfterSeconds: 2592000}); //30days * 24hours * 60 minutes * 60 seconds
let model = mongoose.model('token', schema);
module.exports = model;

Answer 2

You are trying create index using following command.
schema.index({expireAt: 1}, {expiresAfterSeconds: 240});
But the field expireAt does not exist in your schema. And as per the mongo docs :-
If a document does not contain the indexed field, the document will not expire.
Reference:- https://docs.mongodb.com/manual/core/index-ttl/